This AutoCAD DWG file includes a complete Single Line Diagram (SLD) of a Distribution Board, showing circuit breakers, wiring connections, and load distribution for lighting, power, and mechanical systems. Now you have access to a huge range of Schneider Electric CAD files for your projects, without having to call Customer Support and request them. Distribution box floor featuresAn Electrical Distribution Board (DB) is an essential component of any electrical system — it receives power from the Main Distribution Board (MDB) and distributes it to various sub-circuits or equipment. Blue Bird. Development of a distribution box for a meter.